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STUDY ON GROWTH STRESSES IN ALUMINA SCALES FORMED ON Fe-23Cr-5Al AT 1000℃ |
Meishuan Li;; |
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Abstract The average growth stresses in Al2O3 scales formed on Fe-23Cr-5Al alloy during oxidation at 1000℃,in air have been measured by using a new deflection technique.The relaxation of oxide stress has also been studied.The average growth stresses in Al2O3 scales decreased with thickening of the scales,their values were over the range of -1000~-100MPa.The stresses in the substrate alloy were much lower,in the order of 1MPa.Both the substrate alloy and alumina scales might creep at 1000℃.During the annealing of the oxidized specimen,the rate of the stress decrease with time was 6.9~18.4times higher for the scale of 0.039μm than that for the scale of 0.30μm.
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Received: 22 July 2005
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Corresponding Authors:
Meishuan Li
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